

To give you more of an answer than the other guy:
It needs to be national, most of these pesticides are restricted use only. You have to have license to buy it and use it. I don’t know how it works specifically in France but most probably there is some bodie that regulates it use in whole France. It is one market so if it is permitted somewhere it will get everywhere.
I think that the biggest problem is the lack of long term thinking and planning. The polarization in politics doesn’t help - every party is trying to say that it is different from the other one so even in the stuff like defense policy is so fractured across the spectrum.